If two parallel planes are cut by a third plane, then the lines of intersection are _________.
2 answers:
Parallel planes are two planes that do not intersect.
Theorem: If two parallel planes are cut by a third plane, then the lines of intersection are parallel.
In the attached picture you can see two parallel planes P and M that are cut by plane R. The lines of intersection are:
- CD - planes P and R;
- AB - planes M and R.
Conclusion: AB||CD.
Answer: parallel.
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